Method of producing laminate for secondary battery

Patent metadata

Field	Value
Publication number	US-2021036375-A1
Application number	US-201916975392-A
Country	US
Kind code	A1
Filing date	Feb 1, 2019
Priority date	Feb 26, 2018
Publication date	Feb 4, 2021
Grant date	—

Abstract

Provided is a method that enables efficient production of a laminate for a secondary battery including an electrode and a separator that are affixed to each other while also ensuring adhesive strength between the electrode and the separator. The method of producing a laminate for a secondary battery includes: a step (A) of forming an adhesive material on an affixing surface of at least one of an electrode and a separator; a step (B) of, after step (A), conveying the electrode and the separator to an affixing start position without bringing another member into contact with the affixing surface on which the adhesive material has been formed; and a step (C) of, after step (B), affixing the electrode and the separator to each other via the affixing surface. The formed amount of the adhesive material in step (A) is not less than 0.1 g/m2 and not more than 100 g/m2.

First claim

1 . A method of producing a laminate for a secondary battery including an electrode and a separator that are affixed to each other, comprising:
a step (A) of forming an adhesive material on an affixing surface of at least one of the electrode and the separator; a step (B) of, after the step (A), conveying the electrode and the separator to an affixing start position without bringing another member into contact with the affixing surface on which the adhesive material has been formed; and a step (C) of, after the step (B), affixing the electrode and the separator to each other via the affixing surface, wherein a formed amount of the adhesive material in the step (A) is not less than 0.1 g/m 2 and not more than 100 g/m 2 .

2 . The method of producing a laminate for a secondary battery according to claim 1 , wherein the adhesive material is formed of a polymer.

3 . The method of producing a laminate for a secondary battery according to claim 2 , wherein the polymer includes a low-Tg polymer having a glass-transition temperature of 25° C. or lower.

4 . The method of producing a laminate for a secondary battery according to claim 1 , wherein
a composition for adhesion containing the adhesive material and a solvent is supplied to the affixing surface in the step (A), and an amount of coarse particles having a diameter of 10 μm or more contained in the composition for adhesion is 100 ppm or less.

5 . The method of producing a laminate for a secondary battery according to claim 1 , wherein
the adhesive material is formed at one or more locations on the affixing surface in the step (A), and the adhesive material has a formation area of not less than 25 μm 2 and not more than 250,000 μm 2 per location.

6 . The method of producing a laminate for a secondary battery according to claim 1 , wherein formation of the adhesive material is performed by an inkjet method in the step (A).

Assignees

• Zeon Corp

Inventors

• Sato Masanobu
• Oonishi Masuhiro
• Koga Hiroshi
• Tanaka Keiichiro

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0585 Primary

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M50/461 Primary

  with adhesive layers between electrodes and separators · CPC title

• H01M10/058

  Construction or manufacture · CPC title